if u want a music phone i suggest you to stick with w200i only. in other phones (e250, 5200, 3110c, z550i) you'll hafta spend extra for a larger memory card and headset. so that'll effectively increase the cost.
you can also check out SE W300i (it has VGA cam btw, but is a flap phone and comes wid a larger memory card and better headset than even w200i and far far far better headset than any of the other phones mentioned). it may cost a bit more than 6k. do check this out too.